4) A primary school had an enrollment of 850 pupils in January 1970. In January 1980 the enrollment was 1120. What was the percentage increase for the enrollment?
(A) 31.76%
(B) 33.50%
(C) 30.65%
(D) 34.76%

8) In an examination, 900 students were boys and 1100 were girls. If 32% of the boys and 38% of the girls passed the examination, the total percentage (of boys and girls together) of candidates that failed will be?
(A) 35.3%
(B) 62.0%
(C) 64.7%
(D) 68.0%